/**
 * 响应式界面的参照物大小
 */
(function(window, document) {
  function resize() {
    var ww = window.innerWidth;
    // if (ww > 750) {
    //   ww = 750;
    // }
    let size = (ww * 75) / 750;
    size = size > 72 ? 72 : size;
    document.documentElement.style.fontSize = size + "px";
  }
  resize();
  window.addEventListener("resize", resize);
})(window, document);
